JPH06283160A - Maturing/drying device of electrode plate for lead-acid battery - Google Patents

Abstract

PURPOSE:To provide a device maturing and drying electrode plate groups constituted of multiple electrode plates in a short period. CONSTITUTION:In a maturing/drying device maturing electrode plate groups 1 constituted of multiple electrode plates, air feed nozzles 5 feeding the air directly to the electrode plate groups 1 are arranged in a maturing/drying chamber 3. When the composition, temperature, humidity, and feed quantity of the air from the air feed nozzles 5 are properly selected, all electrode plate groups 1 in the maturing/drying chamber 3 can be matured in a short period at the same time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aging drying apparatus capable of aging and drying an electrode plate group in which unformed electrode plates in which a grid is filled with paste are piled up in a number of times in a short time.

[0002]

2. Description of the Related Art A paste-type unformed electrode plate for a lead storage battery is prepared by kneading lead powder in which lead is partially oxidized, water, dilute sulfuric acid and, if necessary, short fibers made of synthetic resin, or various additives. It is made into a paste by filling the grid with the paste, predrying it, adhering it closely, and further putting it in a dryer for main drying. For example, JP-A-5
Japanese Laid-Open Patent Publication No. 4-37227 (hereinafter referred to as "Gazette 1") discloses that the amount of air put into the aging chamber is controlled to shorten the aging time, and Japanese Patent Laid-Open No. 57-180875 (hereinafter referred to as "Gazette 2"). ), A non-polarized electrode plate should be suspended in multiple racks, and the surrounding area should be covered with a sheet that does not have air permeability and water permeability and retains heat, and the top and bottom of the rack should be covered with sheets that have air permeability and water permeability. Is proposed.

[0003]

The purpose of this aging is to adhere the lattice to the active material, improve the strength of the active material, and prevent cracks from occurring in the active material. It is one of the most important processes in the lead-acid battery manufacturing process having the following relationship. For this reason, it generally takes 18 hours to 3 days. Therefore, 7 is required for manufacturing lead acid batteries.
It takes a long time of 10 days. In recent years, there is an increasing demand for shortening this time. This requires shortening the aging time. Therefore, as a result of investigating the reason why this aging takes a long time, there is a large difference between the one that finishes early and the one that finishes late because of the large number of electrode plates placed in the ripening room, and the one that finishes the most late It has become clear that it takes a long time because it is aged according to the electrode plate to be used. The purpose of the aging is to gradually remove water in the electrode plate, first to corrode the grid body to bring the grid body and the active material into close contact with each other, and then to oxidize the metallic lead in the electrode plate.

Further, as a result of investigating the cause of the electrode plate which finishes aging late, the removal rate of water in the electrode plate is extremely slow.
It was clarified that the main reason is that the start time of oxidation of metallic lead is also delayed. The reason why the removal rate of water in the plate is extremely slow is that the humidity around the plate group is higher than an appropriate value or the wind speed around the plate group is slow, so take measures such as installing a fan. Therefore, the wind speed and atmosphere around all the electrode plates in the aging chamber are made uniform, but it is extremely difficult to make them uniform because they greatly change depending on the amount of electrode plates put in it. is there.
In order to eliminate such defects, a number of small constant temperature and humidity chambers are installed, and the amount of electrode plate group put in this is kept constant to reduce the wind speed around the electrode plate group and the variation of the atmosphere to shorten the time. However, there is a drawback that the equipment cost is high.

On the other hand, the main drying after aging is carried out by putting a large number of electrode plates in the dryer as in the case of aging, so that there is a large difference in the drying speed depending on the position of the electrode plates in the dryer. Is recognized. For this reason, since it is performed until the electrode plate group that is the slowest to dry is dried, there is a drawback that the drying time becomes long. The means for solving this is the same as in the case of the above aging, but it has the same drawbacks as the above aging.
Even in the publication 1 for solving such a drawback, the effect of reducing the variation in the aging time of the electrode plate group when aging a large number of electrode plates is not recognized. Further, in Publication 2, when the number of racks is small and the number of electrode plates is small, aging occurs uniformly and the time is shortened. However, when the number of electrode plates is large, the aging time varies greatly. Furthermore, a lot of man-hours are required for attaching and detaching the sheet, and if the number of electrode plates is large as long as a multi-tier rack is used, the variation in the drying time is large as in the case of aging,
It has the drawback of requiring a long drying time.

[0006]

In order to solve the above-mentioned problems, the present invention provides a method in which a gas in the aging / drying device is directly vaporized to each electrode plate of an electrode plate group in which electrode plates having grids filled with paste are stacked. Aging / drying is performed by an aging / drying device in which an air delivery nozzle capable of hitting is placed.

[0007]

The gas of the same temperature and humidity can be supplied to the electrode plates of each stage in the aging / drying device by the air delivery nozzle, so that these plates can be aged and dried in substantially the same time. Becomes Furthermore, since the composition, amount, humidity, etc. of the air sent out from this nozzle can be arbitrarily changed, it is possible to perform aging and drying in a short time by selecting the conditions suitable for aging or the conditions suitable for drying. it can.

[0008]

EXAMPLE An example of the present invention will be described. As shown in FIG. 1, an electrode plate group 1 obtained by stacking a plurality of electrode plates after filling a grid with paste is suspended on an electrode plate suspension frame 2 and placed in an aging drying chamber 3. In the aging / drying chamber 3, air delivery nozzles 5 having air delivery ports 4 provided at regular intervals, for example, every 5 mm, are arranged so that the air directly hits the upper part of the electrode plate group 1. FIG. 2 shows the positional relationship between the electrode plate group 1 and the air delivery nozzle 5. The air sent out from the air sending nozzle 5 directly hits the electrode plates of each stage of the electrode plate group 1 in the aging drying chamber 3 so as to age and dry these electrode plates in the same manner, and the humidity, temperature and composition of the air. Changes. These airs are adjusted to air under conditions suitable for aging or drying by an air conditioner 6, and are sent to the electrode plate group 1 again through an air sending nozzle 5 by an air pump 7.

Next, an example of aging and drying using the aging and drying apparatus according to the present invention will be described with reference to FIGS. 3 and 4. A lead alloy grid is filled with a paste prepared by a conventional method, and a plate group 1 is formed by stacking a plurality of electrode plates preliminarily dried to a water content of about 10%. The board suspension frame 2 is suspended vertically in two stages. Next, air having a temperature of 40 ° C. and a humidity of 70% was supplied from the air delivery nozzle 5 at a wind speed of 3 m / s to the electrode plate group 1.
As shown in FIG. 3, heat generation due to the oxidation of metallic lead started in the upper electrode plate group 1A and the lower electrode plate group 1B from the 30th minute, reached the maximum temperature at 2 hours and 30 minutes, and after 6 hours. Ends and ripening is complete. Upper electrode plate group 1 in this case
The water content of the active material in A and the lower electrode group 1B is 4
%Met.

The air delivery nozzle 5 used in this embodiment
The air outlets 4 are installed at regular intervals of 5 mm and the wind speed is 3 m.
The air can be uniformly applied to the electrode plate group 1 by sending out the air at / s or more. Next, when dry air of 100 ° C. is applied to the electrode plate group 1 by the same air delivery nozzle 5 at a wind speed of 5 m / s, as shown in FIG. The water content was reduced to 0.5% or less. The upper electrode plate group 1C and the lower electrode plate group 1D are the active material water content in the electrode plate group 1.

Comparative Example For comparison, an electrode plate group constructed under the same conditions as in the above embodiment was placed in a conventional aging and drying chamber having the same dimensions as in the above embodiment, which was not provided with an air delivery nozzle, and was aged and dried. I did. In this case, the temperature, humidity, and amount of air to be put into the aging and drying chamber were the same as those in the above-mentioned examples. The stirring of the air in the aging drying chamber at this time was carried out by installing fans in the upper and side portions, as is generally done. In addition,
Here, the water content of the active material of the electrode plate before aging was also set to 10% as in the above example. As a result, as shown in FIG. 5, the temperature of the upper electrode plate group 1E begins to rise from the second hour, reaches the maximum at the seventh hour, and finishes aging at the 14th hour, while the lower electrode plate 1E is finished. Group 1F was slower than this, and the temperature rose from the 4th hour, and the aging was completed at the 18th hour. Therefore, as a result of stopping the aging at 18 hours and measuring the water content of the active material, the upper electrode group 1G was 3.5% and the lower electrode group 1H was 4.8% as shown in FIG. This is the upper plate group 1
This is because the ripening of G was completed faster and the drying was slightly advanced after the completion. Further, although the aging of the upper electrode group 1G progressed faster than that of the lower electrode group 1H, the time required was about twice as long as that of the example.

Next, at the same air flow rate as in the above embodiment, 100 ° C.
As a result of drying by putting the dry air of
As in the above example, in order to reduce the water content in the active material to 0.5% or less, the upper electrode plate group 1G was used for 10 hours and the lower electrode plate group 1H was used.
It took 16 hours. This comparative example is the result when the electrode plate group is vertically suspended in the electrode plate suspension frame by two stages, but by increasing the number of suspension stages, the variation for each electrode plate group of the aging time and the drying time is further increased, Needless to say, it takes longer than the comparative example to age and dry all the electrode plates.

[0013]

As described above, by using the aging / drying apparatus according to the present invention, the electrode plate suspension frame can be delivered by sending air under conditions suitable for aging or drying to the electrode plate group in the aging / drying apparatus. Regardless of the amount of electrode plates suspended, it is possible to age and dry all electrode plates that are suspended in almost the same time in a short time, which is of great industrial value.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an example of a state in which an air delivery nozzle provided with an air delivery port is disposed above an electrode plate group in an aging drying chamber.

FIG. 2 is a schematic perspective explanatory view showing an embodiment of the positional relationship between the electrode plate group and the air delivery nozzle.

FIG. 3 is a curve diagram showing changes over time in the electrode plate temperature when aged under optimum conditions using the aged drying device shown in FIG.

FIG. 4 is a curve diagram showing a change over time in the water content of the active material of the electrode plate when dried using the aging drying device shown in FIG. 1.

FIG. 5 is a curve diagram showing changes over time in electrode plate temperature when aged using a conventional aged drying device.

FIG. 6 is a curve diagram showing a change over time in the water content of the active material of the electrode plate when dried using a conventional aging dryer.

[Explanation of symbols]

1 is an electrode plate group, 1A and 1C are upper electrode plate groups, 1B and 1D are lower electrode plate groups, 2 is an electrode plate suspension frame, 3 is an aging drying chamber, 4 is an air delivery port, 5 is an air delivery nozzle, 6 Is an air conditioner and 7 is an air pump.

Claims (1)

[Claims] 1. An air delivery nozzle for suspending an electrode plate group, which is obtained by stacking electrode plates after filling a grid body with paste, on an electrode plate suspension frame, and for directly applying gas to the electrode plates at each stage of the suspension. An aging / drying device for a lead-acid battery electrode plate, which is characterized by: